To find the start time, we need to subtract the
Elapsed Time from the
End Time.
Here is the step-by-step calculation for each problem:
1)
End Time: 10:30 A.M. |
Elapsed: 7 hours
- Subtract 7 hours from 10:30.
- $10 - 7 = 3$.
- Start Time:
3:30 A.M.
2)
End Time: 8:30 P.M. |
Elapsed: 3 hours 30 minutes
- First, subtract the 30 minutes: 8:30 P.M. becomes 8:00 P.M.
- Next, subtract the 3 hours: $8 - 3 = 5$.
- Start Time:
5:00 P.M.
3)
End Time: 11:00 A.M. |
Elapsed: 8 hours
- Subtract 8 hours from 11:00.
- $11 - 8 = 3$.
- Start Time:
3:00 A.M.
4)
End Time: 6:30 P.M. |
Elapsed: 4 hours
- Subtract 4 hours from 6:30.
- $6 - 4 = 2$.
- Start Time:
2:30 P.M.
5)
End Time: 9:30 A.M. |
Elapsed: 2 hours
- Subtract 2 hours from 9:30.
- $9 - 2 = 7$.
- Start Time:
7:30 A.M.
6)
End Time: 5:30 P.M. |
Elapsed: 4 hours 30 minutes
- First, subtract the 30 minutes: 5:30 P.M. becomes 5:00 P.M.
- Next, subtract the 4 hours: $5 - 4 = 1$.
- Start Time:
1:00 P.M.
7)
End Time: 10:30 A.M. |
Elapsed: 8 hours 30 minutes
- First, subtract the 30 minutes: 10:30 A.M. becomes 10:00 A.M.
- Next, subtract the 8 hours: $10 - 8 = 2$.
- Start Time:
2:00 A.M.
8)
End Time: 7:30 P.M. |
Elapsed: 2 hours
- Subtract 2 hours from 7:30.
- $7 - 2 = 5$.
- Start Time:
5:30 P.M.
9)
End Time: 4:30 A.M. |
Elapsed: 3 hours
- Subtract 3 hours from 4:30.
- $4 - 3 = 1$.
- Start Time:
1:30 A.M.
10)
End Time: 1:30 A.M. |
Elapsed: 1 hour 30 minutes
- First, subtract the 30 minutes: 1:30 A.M. becomes 1:00 A.M.
- Next, subtract the 1 hour: $1 - 1 = 12$ (going back into the previous night).
- Start Time:
12:00 A.M. (Midnight)
11)
End Time: 11:00 P.M. |
Elapsed: 3 hours
- Count back 3 hours from 11:00 P.M.
- 10:00 P.M., 9:00 P.M., 8:00 P.M.
- Start Time:
8:00 P.M.
12)
End Time: 11:30 A.M. |
Elapsed: 2 hours
- Subtract 2 hours from 11:30.
- $11 - 2 = 9$.
- Start Time:
9:30 A.M.
13)
End Time: 9:30 P.M. |
Elapsed: 6 hours
- Subtract 6 hours from 9:30.
- $9 - 6 = 3$.
- Start Time:
3:30 P.M.
14)
End Time: 7:30 A.M. |
Elapsed: 3 hours 30 minutes
- First, subtract the 30 minutes: 7:30 A.M. becomes 7:00 A.M.
- Next, subtract the 3 hours: $7 - 3 = 4$.
- Start Time:
4:00 A.M.
15)
End Time: 8:30 P.M. |
Elapsed: 1 hour 30 minutes
- First, subtract the 30 minutes: 8:30 P.M. becomes 8:00 P.M.
- Next, subtract the 1 hour: $8 - 1 = 7$.
- Start Time:
7:00 P.M.
Final Answer:
1) 3:30 A.M.
2) 5:00 P.M.
3) 3:00 A.M.
4) 2:30 P.M.
5) 7:30 A.M.
6) 1:00 P.M.
7) 2:00 A.M.
8) 5:30 P.M.
9) 1:30 A.M.
10) 12:00 A.M.
11) 8:00 P.M.
12) 9:30 A.M.
13) 3:30 P.M.
14) 4:00 A.M.
15) 7:00 P.M.
Parent Tip: Review the logic above to help your child master the concept of time worksheet primary 2.
